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H. MAIMIN.

FABRIC CUTTING MACHINE.

APPLICATION HLED APR. 11. 1911.

Beissued Apr. 25, 1922.

UNITED HYMAN MAIIVIIN, OF NEW YORK, Y.

FABRIC-OUTTING MACHINE.

Specification of Eteissued LettcrsP-atent. Reisgugd Apr, 25, 1922Original No. 1,186,488, dated. June 6, 1916, Serial No. 34,874, fi1edJune 18, 1915. Application for reissue filed April 11, 1917.

To all whom it may concern:

Be it known that I, l-IYMAN MAIMIN, a citizen of the UnitedStates, and aresident of New York city, in the county of New York and State ofNewYork, have invented certain new and useful Improvements inFabric-Cutting Machines, of which the fol lowing is a specification.

My invention relates to improvements in fabric cutting machines of thetype employing a vertically reciprocating'knife sliding in a standard,which supports the driving device, usually an electric motor, and theparticular mechanism for actuating the knife, together with a protectingguard and presser-foot guide mounted in front of the cutting edge of theknife and capable of a vertically adjustable movement for the pur poseofv bringing the presser-foot into contact with the top layer of fabricto be cut. The knife is a long flat blade of steel sliding freely in agroove in the forward edge of the standard from which it projects forabout one half of its width. It has two cutting edges, the front and thelower. The front edge is known, among those skilled in the art, as theright edge, becausean edge of this character is required for cuttingwhich it does with a saw-like motion, as it is pressed against thelayers of fabric. This edgeis-sharpened by the operator by first movingthe knife guard out of the way and'then byusing an emery stick similarto the scythe rifle, and drawing this emery stick downward alternatelyalong each side of the knife at an angle to form the edge. The lowerknife edge which is known asthe razor edge, because in cutting this edgehas the action of a chisel and requires to be extremely sharp, issharpened by being first removed from the machine and then Whetted orhoned on a fine grained stone or abrasive device similar to 5 that usedfor razors.

The objects of my invention are, first to provide a reciprocating knifefabric cutting machine in which the lower or razor knife edge may besharpened without removing the blade from the machine; second to providea sharpening devicefor accomplishing this that will produce a uniformedge of the character required for the correct operation Serial No.161,356.

of the machine and third that will save the time necessary for theremoval and replacement of the cutting blade.

The several objects of my invention as set forth above and theparticular methods of obtaining, these are now to be described and areillustrated in the accompanying draw-- ings forming part of thisspecification.

Similar characters of reference denote like or correspondin partsthroughout the several views in whic Figure 1 is a partial sideelevation of a cutting machine of the character described showing myinvention; Fig. 2 is a partial rear elevation of the same machine, andFig. 3 is a partial section and front elevation of theoperating -meansfor actuating the sharpening device.

Referring particularly to Fig. 1 of the drawings numeral 1 is the baseplate or foot plate ofthe cutting machine. Rising from this plate andsecured thereto is the standard 2, the upper portion 3 of which forms asupport and guideway into which fits the lower portion 4 of the housingsupporting the electric motor 5 and actuating mecha' uism of thecuttingmachine. The standard 2 is slotted at its forward edge to a depthcorresponding to line 6 and sliding in this slot is a knife 7, the backedge 8 of which norinally'bears against the bottom of the slot 61 Infront of this knife and for the purpose of protecting the operator is aguard 91 secured to the front'of the motor housing and capable ofvertical adjustment for the purpose of bringing the presser-foot andpattern guide 10 into contact with the upper layer of fabric to be cut.The forward cutting edge 11 of the knife 7 requires a rather rough orsaw-like edge for cutting and this is obtained with the use of-the emerystick in the manneras described. The lower edge 12 of the knife 7, whenthis knife is cutting, extends partially inside of the forward edge 13of the standard so that ordinarily the knife has to be removed from thestandard fOr sharpening this edge; however, with my invention I avoidthe necessity of removing theknife by moving the entire driving mechanism and knife mounting forward in relation to the standard so as tobring the entire lower cutting edge 12 beyond the forward edge 13 of thestandard 2 and thus expose the edge 12 for sharpening purposes.

The means by which I move the motor and driving mechanism in relation tothe stand ard consists of a hinge portion 14 secured to the base 4 andhaving helical. faced cam surfaces 15 and 16 between which faces islocated a cam 17 having faces 18 and 19 shaped similarly to and adaptedto co-act with the faces 15 and 16 respectively. Cam 1.7 is held inalinement with part 14 by a pin 20 which permits of a swinging rotationof the cam 17 and of the arm 21 preferably formed integral with 17. Cam17 carries at its central portion a projecting collar 22 which engagesin a slot 28 of the upper portion 3 of the standard 2 and serves thepurpose of preventing a relative movement between the cam 17 and thestandard in the direction of the axis of the pin 20. If the arm 21 isrotated from the position shown in Figs. 1 and 2 in a counter-clockwisedirec tion through 180 it will assume the position 24 shown dotted inFig. 2 and in this rota tion will slide the motor frame 4 backward inreference to the standard and will bring the back edge 8 of the knife 7into contact with the bottom of the slot 6.

The arm 21 carries in a forked end 25, through the pin 27, a short arm26 capable of moving backward against spring 28 which bears against aprojection 29 of a member 31 secured to arm 26. This arm 26 isrestricted in its forward movement by the projection 29 coming intocontact with a finger 30 secured to arm 21. At the lower end of arm 26are secured two members 31 and 32. Between these members is pivoted at33 a frame 34 capable of oscillation transversely and at right angles tothe plane of movement of arm 26. Journaled in frame 34 at 35 is a shaft36 secured to one end of which is a crank having a handle 38 by whichthe shaft may be rotated The other end of the shaft 86 carries aheartshaped cam 39 adapted to operate between the sides of the fork 40formed at the lower end of member 32. This cam upon its rotation causesthe frame 34 to swing through the are C, D, having about equal periodsof movement and rest during one rotation of the shaft; that is, theframe moves from D to C during about 90 rotation of the shaft 36, thenremains at rest during the next quarter turn, then moves from back to Dduring the third quarter period and remains at rest during the fourthquarter period back to the first position mentioned.

At the lower end of the frame 34 are projecting pins 41 and 42. The axisof each of these pins is at right angles to the plane of the side of theknife edge 12 on the same side when the frame 34 is in the operativeposition for grinding either kni fe face.

Mounted on these pins 41 and 42, so as to oscillate thereon, are spools43 and 44 held on their respective pins by collars 45 and 46. Secured tothese spools and extending forward are arms 47 and 48 carrying mountedon their ends and capable of oscillating thereon holders 49 and 50 towhich the grinder stones 51 and 52 are secured by any of the well knownmethods. The holders bear against collars 53 and 54 and are held on thearms 47 and 48 and rotated toward each other by the springs 55 and 56.This rotation however is limited by shoulders 57, 57, against whichsimilar shoulders 59 and 60 on the holders are adapted to engagerespectively. The arms 47 and 48 are 'oppositely reciprocated by aforked lever 61 pivotedto frame 34 at 62 and having forked ends 63 and64 engaging the arms 47 and 48 respectively. The lever 61 is oscillatedback and forward through the rotation of a heart-shaped cam 65 securedto shaft 36 and-engaging the forked-end 66'of lever 61. Thecam 65 is sotimed in relation to the cam 39 that it serves to oscillate the lever 61during those periods when the frame 34 is at rest on lines 0 or D. Thecam 65 is further timed to commence an upward movement of arm 47 whenthe frame 34 has been swung to line D and the grinder stone 51 is inspring contact with the face of edge 12, thus producing by the upwardand outward sweeping contact ofthe grinder stone with the edge 12 thecorrect grinding action. While stone 51 was moving upward in contactwith knife-edge 12, stone 52 was moving downward out of contact with theop posite face of edge 12 and upon the continued rotation of the handle38, after stone 52 reaches its lowest position of travel, the frame 34will swing to position G thereby bringin stone 52 into contact with theknife-e ge 12.

For holding the arm 26 in alinement with the standard, projectingfingers 67, 67 are secured to member 32. These fingers engage oppositesides of the standard when the arm 26 and frame 34.are swung fromposition 13 to position B, at which time the stones 51 and 52 move pastthe standard, one on either side of same, into their operative positionas shown in Fig. 1. After the knife edge has been sharpened in themanner described, the frame 34 carrying the sharpening mechanism ismoved to position 13 and then the entire sharpening device is rotated tothe position 24 where it is held out of the Way by the spring catches 68and 69. This upward swinging movement to position 24 retracts the knifeinto the standard and leaves the machine in normal operative position. 4

In various ways the details of construction may be modified withoutdeparting from the principle involved; the stones may be moveddownwardly in contact with the knife edge and different mechanism may beused to accomplish the opposite reciprocation of these stones, Alsoother cam devices may be used to produce the relative movement betweenthe operative parts of the machine and the standard through the agencyof an arm swingingg into a position in line with the standard, or therelative movement between the knife and the standard may be produced bythe movement for bringing the stones into the operative position oneither side of the knife. I do not therefore wish to be confined to thedefinite construction described and illustrated herein.

- I claim:

1. In a fabric cutting machine provided with a standard having a grooveembracing a knife which is adapted to reciprocate therein with its frontand lower cutting edges ex- )osed for cutting, the combination of meansor producing a relative movement between the knife and the standard soas to expose the lower edge of the knife for sharpening and :lneans forsharpening the edge thus exose p 2. In a fabric cutting machine providedwith a standard having a groove embracing a knife which is adapted toreciprocate therein with its front and lower cutting edges exposed forcutting, the combination of means for advancing the knife in thestandard to expose the lower cutting edge of the knife for sharpeningand means for sharpening the edge thus exposed.

3. In a fabric cutting machine provided with a standard having a grooveembracing a knife which is adapted to reciprocate therein with its frontand lower cutting edges exposed for cutting, the combination of meansfor advancing the knife parallel to its operative position in thestandard to expose the lower cutting edge of the knife for sharpening.

4. In a fabric cutting machine provided with a standard having a grooveembracing a knife which is adapted to reciprocate there in with itsfront and lower cutting edges exposed for cutting, the combination ofmeans for advancing the knife partially from the standard so as toexpose the lower cutting edge of the knife'for sharpening and means forsharpening the edge thus exposed.

5. In a fabric cutting machine having a standard provided with a grooveembracing the blade of a knife which is adapted to be reciprocatedtherein by a driving element supported upon the standard and in wh chthere is a protecting element for guarding the knife, the combination ofmeans for producing a relative movement between the driving element,knife and protecting ele ment and the standard to expose the lower edgeof the knife for sharpening.

6. In a fabric cutting machine having a standard provided with a grooveembracing the blade of a knife which is adapted to be reciprocatedtherein by a driving element supported upon the standard and in whichthere is a protecting element for guarding the knife, the combination ofmeans for advancing the driving element, knife and protecting element inrelation to the standard for exposing the lower edge of the knife forsharpening.

7. In a fabric cutting machine having a standard provided with a grooveembracing the blade of a knife which is adapted to be reciprocatedtherein by a driving element supported upon the standard and in whichthere is a protecting element for guarding the knife, the combination ofmeans for moving the elements supported by the standard in relation tothe standard to expose the lower edge of the knife to enable the same tobe sharpened.

8. In -a fabric cutting machine having a standard provided with a grooveembracing the blade of a knife which is adapted to be reciprocatedtherein by a driving element supported upon the standard and in Whichthere is a protecting element for guarding the knife, the combination ofmeans for sliding forwardly the elements supported by the standard inrelation to the standard for exposing the lower edge of the knife toenable the same to be sharpened.

9. In a cutting machine having a reciprocating knife, a standardprovided with a groove which embraces the blade of the knife leaving thefront and lower cutting edges exposed for cutting, means for producing arelative movement between the knife and the standard so as to expose thelower edge of the knife for sharpening, and sharpening means comprisingtwo abrasive elementsadapted to be brought into their operativeposition, one on either side of the standard from the back edge of same,for sharpening the lower edge of the knife.

10. In a cutting machine having a reciprocating knife, a standardprovided with a groove which embraces the blade of the knife leaving thefront and lower cutting edges exposed for cutting, means for producing arelative movement between the knife and the standard so as to expose thelower edge of the knife for sharpening, and sharpening means comprisingabrasive elements adapted to be brought alternately into sliding contactwith the opposite sides of the lower edge of the knife for the purposementioned.

11. In a cutting machine having 'a reciprocating knife, a standardprovided with a groove .which embraces the blade of the knife leavingthe front and lower cutting edges exposed for cutting, means forproducing a relative movementbetween the knife and the standard so as toexpose the lower edge of the knife for sharpening, and sharpening meanscomprising reciprocating abrasive elements adapted to be broughtalternately into sliding contact with the opposite sides of the loweredge of the knife for sharpening same.

12. In a cutting machine having a reciprocating knife, a standardprovided with a groove which embraces the blade of-the knife leaving thefront and lower. cutting edges exposed for cutting, means for producinga relative movement between the'knife and the standard so as to exposethe lower edge of the knife for sharpening,- and sharpening meanscomprising reciprocating abrasive elements adapted to be broughtalternately into sliding contact with-the opposite sides of the loweredge of the knife during their upward movement for sharpening same.

18. A reciprocating knifefabric cutting machine comprising a base, astandardrising from the base, a knife reciprocating in the standard, aknife reciprocating motor mounted on the standard and adapted to beadvanced in relation thereto, an arm on the standard adapted to be swungdownwardly to a position back of the standard and in line therewith, aconnection between the arm and the motor whereby the motor isadvancedwhenthe arm is lowered and sharpening means mounted on the arm and"arranged to be moved forward into operative position for sharpening thelower edge of the knife.

14. In acutting machine, a reciprocating knife, a standard having agroove which embraces the blade of the knife leaving the front and lowercutting edges exposed for cutting, means for reciprocating the knifewhile so embraced by the standard, said means being mounted on thestandard and adapted to be advanced inrelation thereto, a swinging armcarrying sharpening means, and a connection between the arm and thedriving elements whereby the knife is ad vanced to expose its lower edgefor sharpening when the swinging arm is lowered to a position whichbrings the sharpening means into sharpening relation with the advancedlower edge of the knife.

15. Means for sharpening the lower edge of the knife of a cuttingmachine of the character described, comprising abrasive elements adaptedto be swept alternately over opposite sides of the lower edge of theknife at substantially right angles thereto for the purpose ofsharpening the same.

16. Means for sharpening the lower edge of the knife of a cuttingmachine of the character described, comprising abrasive elements adaptedto be reciprocated alternat'ely over opposite sides of the lower edge ofthe knife at substantially right angles thereto for the purpose ofsharpening the same.

17. Means for sharpening the lower edge of a vertical knife of a cuttingmachine of the character described, comprising reciprocating abrasiveelements adapted to be swept alternately in an upward direction over thesides of the lower edge of the knife for sharpening the same.

18. Means for sharpening the lower edge of a vertical knife of a cuttingmachine of the character described, comprising a pair of rocking arms,stones on the swinging ends of the arms adapted to be positioned onopposite sides of the knife, and means for rock ing the arms to sweepthe stones upwardly and outwardly over opposite sides of the lower edgeof the knife to sharpen the same.

19. Means for sharpening the lower edge of the knife of a cuttingmachine ofthe character described, comprising a pair of inde pendentlymovable stone carriers, stones on the carriers adapt-ed to be positionedon op posite sides of the knife, and means for mow ing the stonecarriers to sweep the stones, singly and alternately, over oppositesides of the lower edge of the knife at substantially right anglesthereto to sharpen the same.

20. Means for sharpening the lower edge of the knife of a cuttingmachine of the character described, comprising a pair of rocking'arms,stones on the swinging ends of the armsadapted to be positioned onopposite sides of the knife, and means for moving the arms from side toside and for rock ing them to sweep the stones singly and alternatelyagainst the opposite sides-of the loweredge of the knife to sharpenthesame.

21. Means for sharpening the lower edge of a vertical knife of a cuttingmachine of the character described, comprising a pair of stones adaptedto be arranged on opposite sides of the knife, and means for carry ingand moving the stones to first move one stone laterally into sharpeningrelation to the lower edge of the knife and then to sweep that stoneupward along the surface of the knife, then to move the stones laterallyin reverse direction to bring the second stone into sharpening relationwith the other side of the lower edge of the knife, and then to sweepthe second stone upward along the surface of the knife, for the purposementioned.

22. Means for sharpening the lower edge of the knife of a cuttingmachine of the character described, comprising a pair of stones adaptedto be ositioned on opposite sides of the knife, an lndependentlyactuable carrier for each stone, and means for actuating the carriers tosweep the stones singly and alternately over opposite sides of the loweredge-of the knife at substantially right angles thereto to sharpen thesame, the stones being rotably mounted on their carriers and springpressed toward sharpening; contact with the knife.

23. Means for sharpening the lower edge of the knife of a cuttingmachine of the character described, comprising a pair of stones adaptedto be positioned on opposite sides of the knife, p-ivotal'ly mountedcarriers for the stones, a plurality of cams and means for rotating thesame, and mechanism operated .by the cams to bring the stonesalternately into sharpening relation with the lower edge of the knife,and to' rock the stone-carriers on their pivots to sweep the stonesalong the surface of the knife for the purpose mentioned.

24. Means for sharpening the lower edge of the knife'of a cuttingmachine of the character described, comprising cam mecha nism, a pair ofpivoted frames actuated by v the cam mechanisrmand a pair of stones themovements of which are controlled by the movements of the frames, one ofthe frames acting to move the stones from side to slde to bringthemalternately into sharpening and alternately along the surface of theknife for the urpose mentioned, cans for sharpeningthe lower edge *oftheknife of a cutting-machine of the character described, comprising asupport, a

. frame ivotedon the support, asecond frame pivote on therfirs tmentioned frame, stonecarriers pivoted-on fthe first frame and engagedby thewsecond frame, stones on the stone-carriers, and rotary'meansforactuating both frames tomo ve'the stone-carriers from side toside tobring the stones alternately into sharpening relation with the loweredge of the knife, and' for sweeping the stones singly and alternatelyalong the surface of the knife, for the purpose mentioned. I

26. Means for sharpening the lower edge of the knife of a cuttingmachine of the character described, comprising a support, a memberpivoted on thesupport, a yoke fixed on the support, a rotary cam carriedby the member andengaging the oke, a yoke pivoted on the member, a seconrotary cam on the memberand engaging the second yoke, a pair ofstone-carriers operatively connected to the second yoke, stones on thecarriers, and means for rotating the cams, whereby the stone-carriersare moved from side to side to bring the stones alternately intosharpening relation with the lower edge of the knife, and the stones aresingly and alternately swept along the surface of the knife, for thepurpose mentioned.

27. Means for sharpeninglthe lower edge of the knife of acuttingmachine-of the character described, comprising a support, a

frame pivotally suspended from theisupport bearing, a cam onzthe shaft,a relatively sta- I 7 and carrying a shaft bearing, a shaft in therelation with the edge of the knife and the other frame acting tosweepthe stones singly tionary yoke engaged by the earn, a pair ofstone-carriers pivoted on the frame, stones on the carriers, a secondcam on the shaft,

and a pivoted member onthe frame actuated by the second cam for rockingthe stonef carriers on their pivots, whereby the stone-1 carriers aremovedfrom side to sldeto bring the stones alternately into sharpeningrelation with the lower edge of the knife, and the stones are singly andalternately swept along the surface of 'theiknife, for the purposementioned, I 1

g In testimony whereof I aifiX my signature.

' HYMAN MAIMIN,

